Question

Which of the following differentiate a frog from a toad?
A. Frog has no exoskeleton but a toad has scales.
B. Frog respires through lungs but toad respires through skin.
C. Frog has no parotid glands but toads have a pair of them.
D. Frog has a tail but a toad has no.

Answer 1

Frog and toad both are the amphibian animals. Amphibian animals are the one that live on land as well as breed in water. These animals also undergo metamorphosis. Amphibians are one class of cold blooded animals.

Complete answer:
Both frog and toad look similar. In spite of having similar characteristics they even have many differences.
1. Frogs do not have an exoskeleton because these are vertebrates (having backbone and internal skeletons). Frog and toad both do not have feathers, fur or scales on their body. Their skin is moist and the skin layer is covered with mucous glands. They use their skin to breath.
2. As mentioned above frogs breathe through their skin. And toad respire through skin as well as lungs but not all the time like human beings.
3. Frog has no parotid glands but the toad has a pair behind the tympana.
4. Both the amphibians frog as well as toad have no tail.

Hence, the correct answer is option (C)

Note: The word amphibian is derived from Greek word “amphi”. That means dual or both kinds and the word “bio” means life.
More examples of amphibians along with frogs and toads are salamanders and newts.